Plain-language answer: Signal-to-noise ratio compares desired signal power with noise power in a defined measurement bandwidth.
Why the definition matters
A positive SNR means signal power exceeds noise in that bandwidth; narrow filters can improve measured SNR by excluding noise even though received signal power is unchanged.
Use the number correctly
State bandwidth, detector, averaging, and measurement point when comparing reports, modes, or receivers.
The common mistake
Comparing SNR values from different bandwidths or reporting systems as if they are identical.
Measurement and safety boundary
Keep reference units, bandwidth, detector, direction, averaging, and test conditions attached to every number. Current regulator requirements and the complete installed system control RF-exposure compliance.
